doas, available on OpenBSD as part of the default system, is a simpler replacement for sudo.
Become root user and then copy doas configuration file from /etc/examples/.
cp /etc/examples/doas.conf /etc/
Use your favorite editor or vi or Emacs clone mg which are included in the base to edit /etc/doas.conf. Add the word “persist” after “permit” to enter your password less often.